Rotary engine.



Nox' 723,656. PATENTED MAR. 24, 1903. H. T. DUNN.

ROTARY ENGINE.

APPLICATION FILED JULY 14. 1899.

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PATENTED MAR. 24 1903 H. T. DUNN. ROTARY ENGINE. APPLICATION FILED JULY 14, 1999.

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30 MODEL.

nor-Aer SPECIEIGATXBN forming part; of Letters Application filed il'ulyl, 1899.

To all whom it may concern:

Be it known that 1, HUGE THOMAS. DUNN, acitizen of the United States, residing in New York, in-the county of-New York and State of New York,have invented certain new and useful Improvements in Rotary Engines; and I do hereby declare the following to be a full, clear, and exact description of my invention, such as will-enable others skilled in the art to which it appertains tomake and use the same.

.My invention relates. to improvements in rotary engines, the objects being to provide an improved packing, combined with means for supplying lubricating material thereto, and also to provide means whereby to lessen the friction engendered during the operation ,of my'device.

To this effect my improvements are directed toward the provision of a steam, gas, and air tight cylinderin a rotary motor by means cam-plates and also in the provision of a dividing bridge abutment between the inlet and outlet ports, as well as providing packing at the edge of the piston, which packing will contact with the cylinderheads, and to reduce the friction by means of roller-bearings located on the movable parts, and a supply of lubricant to the motor.

My invention further consists in the provision of new and improved mechanisms in connection with the working parts of the motor, all of which will be more fully described hereinafter, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a side elevation having the cylinder-head, shaft, and circular plates removed to show the interior of my rotary motor with the piston and connected parts in position. Fig. 2 is a sectional view showing the piston and arrangement of packing-rings. Fig. 3 is a detail showing the contact of the packingrings with the cylinder-head, Fig. 4 is a detail of the bearing'blocks in the dividingbridge. Fig. 5 is an edge view of the same. ig. 6 is a detail of the plate M. Fig. 7 shows the mortise by which the cam-sections of the plates are joined to each other. Figs. 8, 9, and 10 are-views on different lines. Fig. 1-1 is an tion of one of the cam-plates. detail of one of the wedge-plates.

Fig. 12 is a Fig. 13 is ofcam-plates constructed edge eleva- ENGlNE.

Patent No. 723,656, dated March 24, 1903.

Serial No. 723,877. on models a detail showing the roller-hearings, and Fig. 14 is an end elevation in section of my entire construction. I

My invention comprises a cylinder-band Gr, suitably supported upon a base ll. This cylinde'r-band is provided with inlet and exhaust ports I and J, respectively. -'lhe cylinderband, support, and inlet an exhaust ports may be cast in one pier. l sired.

-Qylinder-heads 4. l 1, which embrace the cured to the hand by or shown in Fig. 14. These 7 with annular offsets 3 3, l of the heads, and these vided with exteriorly-thro The outer ends of these be: recessed, as at 5 5. Bee cessed ofisets are circular centrally-located shat" and extending out thr Internally-threaded s over the projectin and are secured up ends of thejonrnal in the sonically-rec and the striding hos packing to render the The plates G G are seer to a circular piston F by means of cocoa sunk bolts received within the recesses O O in the piston. This piston is located eccentrically of the piston-chamber and is'provided 'ith oppositely located annular grooves B In its outer periphery. these grooves are pro ided with a vertical inner wall and a slanting enter wall, the line of which starts a short distance oelow the periphery of the piston. be-noted that by this construction the periphery of the piston is slightly narrower in width than is the main body portion of the piston and is dovetailed in cross-section, as shown'in Fig. 2. Apertures 5' 5 connect the two oppositely-located grooves B. Within these grooves is located a plurality of packlug-rings, sections, the adjacent ends of the sections being beveled or'chamfered, the opposite ends ot-each section. being beveled in opposite directions, asshown in Eig. 1. These re provided eccentricall y are each pro- C C, having nred thereto lournals s 4.

the journals ted suitable steam-tight.

it will thus each ring composed ofsegmentalpacking ring sections are also angular in a cross-seetion and adapted to'be received with in the grooves B B". The inner ring P is generally of metal of triangular form. Springs q q are located within apertures 5' 5 and contact with the sections of the inner ring P,

whereby the angular sections of the packingrings are continually forced out of the groove and against the cylinder-heads to preservea tight joint. The packing-rings A A engage the sides of the cylinder-heads alittle in advance of the dovetailed periphery of the piston. \Vhen the segmental packing-rings have been Worn down so that the ring P has approached the outer end of the groove, new packing may be supplied to the groove.

The piston is composed of two semicircular sections,and between thpse sections is formed a space within which are located the pressure cam-plates. These cam-plates I) B are slidingly retained within the space 01' slot and. are composed of angular plates loosely connected by tongue-and-groove joints, as shown in Fig. 18. These cam-plates extend. the entire width of the cylinder-band and are pro-,

vided at their longitudinal outer sides with packing 6 6, which contacts with the cylinder-heads to make a tightjoint. As shown in Figs. 8, 9, and 10, the number and shape of the angular sections composingone of these plates may be varied, and I do not wish to limit myself to any particular form. Forinstance, Fig. 8-showsa cam-plate composed of three sections R R R, which are connected by means of tongue-and-groove joints, the

sections having a slight sliding connection with relation to one'anotheru. Figs. 9, and 10 show other forms in which the sections may bemade, the sections in each case being connected by means of tongue-and-groove joints, as shown in Fig. 7. The outer ends of these plates contact with the cylinder-band and are provided with roller-bearings D, whereby to lessen'the friction. These roller-bearings are automatically forced outward against the oyl inder-band by means of springs 7. four of these plates shown in Fig. 1, two upper plates and two lower plates, and a. dividingplate C,extending the entire length of the space or slot between the two halves of the piston, serves to separate the two upper from the two lower plates.

On either side of the dividing-plate C is located a pair of auxiliary cam-plates C C, constructed similarly to plates ll, but not provided with roller-bearings at their outer ends. The outer ends of cam-plates ll l" and (1) 0 are formed of any suitable bearing meta Narrow alincment-plates :r: a; arelocated within the space between the half piston-sections and directly-behind the sliding plates 5' l3 and (3 G on either side of the dividingplate G, and springs N N extend between and have their ends contacting with the aliasmentrplatcs m :1:, whereby to force them out of the space and against the cylinder-band.

Atcach end of the semicircular piston-soc tions are formed wcdge'shapcd grooves 7 7 There areopening into thespace therebetween, and within these wedge-shaped grooves are located antifrictiou-rollers 8 8, set in bearing -metal E E. The rollers contact with the sliding plates 13' ll and tend to lessen the friction between the plates and the-sides of the pistonsections.

The cylinder-band is provided with an integral offset- K of' rectangular shape, within which is received the movable dividing bridge or abutment, the oltset being located between the inlet and outlet ports. This movable abutment comprises a plurality of plates L, each formed of angular sections in the same manner as are the cam-plates B B and, like them, provided with bearing metal at their-outer ends, in which are located antifriction roller bearings 0 9, as shown in Figs. 1 and 5. The sections of which thesebridge, plates are formed are adapted to slide upon each other slightly, and the angular section of each plateb'rcaks joint with the angular sections'of the adjacent plates.

A U-shaped stop-plate M is located above the sliding bridge-plates L L and is of a size to register with the area of the offset. The

upper free ends of the stop-plate are adapted to abut against thatportion of the cylinderband forming the top of the offset. A spring E is located within the offset between the arms of the U-shaped stop-plate. This spring has its ends bearing against the cylinder-band and stop-plate, respectively, whereby to exert a continual pressure upon the latter to force the sliding bridge-plates downwardly in contact with the periphery of the piston. The

stop-plate operates to force the bridge-plates equally limit to regulate the compression of the spring. I p

A system of pipes V V, provided with turning plugs 10 10, are connected with any snitble oil-reservoir, (not shown,) which forces the oil therethrough. Branch ipes V V connect the main pipes V V with he interior of the rotary engine. through the cylinderout of the olfset and also provides a heads \I \V, the oil being supplied to the points of greatest friction at the points where the sectional packing-rings contact with the cylinder-heads, to the bridge or sliding abutments, and to the sliding cam-plates. A dripcock (not shown) permits the withdrawal of the oil in the usual manner. i

As a convenient means for forcing the oil through the pipes into the motor I may employ a pump connected to the shaft of the motor by means of a crank or an eccentric.

It is obvious that many changesmight be made in the form and arrangement of the several parts described without departing from the spirit and scope of my invention, and 1 a piston provided with grooves, one wall of which is fOIIiJdI'OH an angle to the point to be packed, a plurality of rows of angularlyformed packing material set in the grooves, springplaced in the grooves, and an angu larly formed block located between the springs and the packing, the block forced against the packing by the tension of the spring to cause the packing to fit tightly against the cylinder-head and form a tight joiutas well as take up wear in the packing.

2. In a rotary motor, the combination with a piston, the piston comprising two semicircular sections spaced apart from each other, of a plurality of series of oppositely-extending cam-plates slidingly received in the space between the piston -sections, the cam plates composed of a plurality of angularly-formed sections having tongue-and-groove connections with each other, means for forcing the cam-plates outward and a dividing-plate located between the upper and lower sections.

3. In a rotary motor, the combination with a piston having a slot therein, of cam-plates movably located in the slot, the cam-plates each comprising a plurality of angular sections meshed one with the other, and a second integral plate interposed. between the cam-plates, alinement-plates located in the rear of each cam-plate and springs bearing against the alinement-plates whereby to force the cam-plates outward, the cam-plates also forced outward by centrifugal action.

e. In a rotary motor the combination with a rotatable piston, of sliding cam-plates located in the piston, the ends of the cam-plates adapted to bear continuously against the sides of the rotary motor, roller-bearings located in the piston, the cam-plates in contact with the roller-bearings, the plates composed of sections having loose connection with each other and means located between the sections whereby to automatically force them apart, the roller-bearings received, in apertures formed in the piston parallel with the camplates.

5. A rotary motor comprising a piston hav: ing oppositely-located grooves therein, a plurality of rows" of; angularly-formed packing material set in the grooves, springs located in apertures connecting the oppositely-locatedgrooves, an angnlarly-formed ring located between the spring and packing, the ring forced against the packing by the tensi'on of the spri'ng. to causethe packing to fit tightly against the cylinder-heads and form a tight joint, the springs operating to take .up wear in the packing.

6. In a rotary motor, the combination with a cylinder-band having a closed offset formed therein, and cylinder-heads secured to the band, of a plurality of abutment-plates freely and slidingly received in the offset, the abutment-plates each comprisinga series of beveledged sections, the beveled edges of one plate breaking joints with the beveled edges of the other plate, a stop-plate located within the offset, means for automatically forcing the plurality of plates out of the ottset, the stopplate inclosing'the automatic means and operating to prevent the abutment-plates from being forced too far into the offset.

7. A rotary motor comprising a cylinderband having an offset therein, cylinder-heads secured to the band and corresponding in shape to the outline thereof, a rotary piston mounted within the casing thus formed, a plurality of cam-plates slidingly received in the rotary piston, a dividing-bridge located in the ottset, the bridge comprising a plurality of plates, the plates each composed of I sections loosely connected together, roller bearings located at the outer ends of each plate in contact with the piston, a stop-plate located in the rear of the bridge-plates, the stop-plate serving to aline the bridge-plates and limit their movement in one direction, means located within the stop-plate'for constantly forcing the bridge-plates into contact with the piston, the-dividing-bridge located. between the inlet and outlet ports.

8. A rotary motor comprising a casing provided with inlet and outletports, a pistonmounted to r'otatethereiu, the piston provided with antomatically-extensible packing,

the packingbearing against the casing and an automatically extensible abutmentlocated between the inlet and exhaust ports, the enter end of the abutment bearingcontiuuously against the periphery of the piston.

J. A rotary motor comprising a cylinderband, cylinderheads secured thereto, a, pisston mounted to rotate therein, automaticallyextended cam-plates loosely and slidingly re ceived within the piston, the ends of the camplates in contact with the cylinder-band, and packing material located in the side edges of the cam-plates, the packing adapted tct'bear against the cylinder-heads.

Having thus described my invention, I hereby attlx mysignature in the presence of two. witnesses.

a HUGH THOMAS DUNN.

Witnesses:

JoHN Kinsman, JOHN J. COLBERT. 

